davidbat2004 2017-10-6 08:28 PM
[[i] 本帖最後由 davidbat2004 於 2017-10-8 12:31 AM 編輯 [/i]]
ppresent 2017-10-6 10:52 PM
1. I think a person who knows how to do differerntiation can spell "derivative" correctly, at least way better than "deverative".
2. For the second derivative to equal zero, you would have 10xy=3 and x=0.3/y.
Just plug this into ln(5y)=5xy you can find y and so is x. If you plot the curve you would see that it is an inflection point.
davidbat2004 2017-10-6 11:47 PM
I got it..Thank You!!
I make a spelling mistake here...Sorry~~